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Throughout the world, Масаки (Masaki , Terusato , 正木 , and others...) is quite a common predominantly masculine, but very seldom feminine given name. The first name Масаки is characteristic of Japan, where it is quite a rare male name, Tanzania, where it is a rare boy's name, and Brazil. Measured by absolute frequency, it is the most numerous in Japan, China, and Brazil. Also, Масаки is the last name as well as the forename.
Масаки is also a name for the fictitious and mythical characters: Masaki Uehara , the Ao-chan Can't Study!'s character and Masaki Mayuka , character in Tenchi Muyo!.